少主梁正交各向异性钢板梁是日本对多箱单室钢箱梁的进一步省力化优化,通过增大U肋断面,以扩大横肋间距,减少腹板数量的同时减少横肋数量。增加顶板厚度,抑制焊接引起变形,提高可制造性大量减少焊接和后期维护涂装等工作量。进一步方便施工和养护。
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桥梁概况
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孔跨布置:23+34+23m;
梁高:1.4m,端部渐变到1.3m,跨高比24.3;
曲线半径330m,曲梁曲做;
桥梁14m,采用7道钢主梁;
跨度较小,梁高不大,(小跨度采用钢箱梁时人孔设置决定了最小梁高不能过小)采用正交各向异性桥面钢板梁,便于制造、施工、后期养护;
主梁间距2m,悬臂1m,小跨度减小剪力滞效应增加顶板材料使用效率。
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左侧悬臂与边主梁为一个焊接件
右侧悬臂与两个主梁为一个焊接件
基本按照运输宽度控制
顶板、腹板及底板均采用螺栓连接;
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-8.png)
隔板设置:每隔4.25m设置一道隔板
隔板高度0.8m,悬臂根部0.45m
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在隔板对应位置设置一道水平对顶板
由于桥面板采用板肋
在隔板之间设置3道小隔板
小隔板高度0.45m,与外侧悬臂对正
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-10.png)
4.25m纵向间距的隔板
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-11.png)
隔板之间的小横肋,减小桥面纵向第二体系
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-12.png)
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第一道纵梁及第二道纵梁之间
纵向设置下平联,加强整体性
同时曲线桥梁减小曲线造成的次效应
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-16.png)
中支点下缘隔板间距(4.25m)
所有纵梁之间设置下平联
减小主梁负弯矩受压下缘面外受力长度
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-17.png)
边支点下缘所有纵梁之间同样设置下平联
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-18.png)
曲梁曲做
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-19.png)
下平联高度在隔板以下250mm位置
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-20.png)
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下平纵联节点板构造
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-23.png)
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支座位置支承加劲肋
底板局部横向加宽
钢制排水管,水力坡度大,加速排水
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-25.png)
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横向拼接位置
![](https://www.bmbim.com/wp-content/uploads/2022/04/640-29.png)
适用于:装配式空心板桥梁改造
下部结构利用,更换空心板
小跨度宽桥